type of curb

1�” wide curb cut

(Street/Parking Lot)

Pea gravel at curb cut opening

Standard curb(Landscape Area)

Standard Curb Cut Plan view

2” minimum drop from asphalt grade to finish

grade of landscape

Standard curb

Slope entry point of curb cut to direct street runoff into stormwater facility

Street/parking lot surface

(flow)

Figure 5-32: A standard curb cut allows stormwater runoff to enter a parking lot rain garden. This curb cut has 45 degree chamfered sides.

DESiGn DEtaiLS: Types of curb cuts

•opening should be at least 18 inches wide

•the curb cut can have vertical sides or have chamfered sides at 45 degrees (as shown)

•works well with relatively shallow stormwater facilities that do not have steep side slope conditions

•need to slope the bottom of the concrete curb cut toward the stormwater facility

•a minimum 2 inch drop in grade should occur between the curb cut entry point and the finish grade of the stormwater facility

•pea gravel can be used as a stable mulch material at the curb cut opening to prevent erosion

sou

rce:

neV

ue

ng

an

ass

oc

iate

s

s a n m a t e o c o u n t y s u s t a i n a b l e g r e e n s t r e e t s a n d p a r k i n g l o t s g u i d e b o o k132

Standard Curb Cut Section view

1�” wide curb cut with side wings


Standard curb(Landscape Area)

2” minimum drop from throat of curb

cut to finish grade of landscape

Standard curb cut with side wingsSlope entry point of curb cut to direct street runoff into stormwater facility


Side wings help retain side slope grade for stormwater facilities

(flow)

Pea gravel at curb cut opening

Figure 5-33: A standard curb with wings allows stormwater runoff to enter a stormwater facility. The wings help retain the side slope grade on each side of the curb cut opening.

Stormwater facility side slope


•opening should be at least 18 inches wide

•works well with stormwater facilities that have steeper side slope conditions

•need to slope the bottom of the concrete curb cut toward the stormwater facility

•a minimum 2 inch drop in grade should occur between the curb cut entry point and the finish grade of the stormwater facility

•pea gravel can be used as a stable mulch material at the curb cut opening to prevent erosion

sou

rce:

keV

in r

oBe

rt p

errY

- c

itY

oF

port

lan

D

133

Standard Curb Cut with Side wings Plan view

Standard Curb with Side wings Cut Section view

c h a p t e r 5 • k e y d e s i g n a n d c o n s t r u c t i o n d e t a i l s

1�” wide flush concrete curb


(Landscape Area)

2” minimum drop from flush curb grade to finish

grade of landscape

Slope flush curb to direct street runoff into stormwater facility


(sheet flow)

Figure 5-34: This flush concrete curb allows stormwater runoff to enter, evenly distributed, within a vegetated swale.

Concrete Flush Curb Plan view

Concrete Flush Curb Section view

concrete flush curb


•concrete flush curbs allow stormwater runoff to enter a stormwater facility evenly alongside a street or parking lot edge

•need to slope the concrete flush curb toward the stormwater facility

•a minimum 2 inch drop in grade should occur between the flush curb and the finish grade of the stormwater facility

•there is no need for pea gravel along the curb edge for dissipating concentrated flow

sou

rce:

h

ttp:

//Va

nc

ou

Ver

.ca

/en

gsV

cs/

stre

ets/

Des

ign

/en

Vir

o.h

tm

s a n m a t e o c o u n t y s u s t a i n a b l e g r e e n s t r e e t s a n d p a r k i n g l o t s g u i d e b o o k134

Standard wheelstop


(Landscape Area)

Provide at least �” of space between wheelstop and edge of asphalt

2” minimum drop from asphalt grade to finish

grade of landscape

Standard wheelstop


Provide at least �” of space between wheelstop

and edge of asphalt

(flow)

Pea gravel at wheelstop opening

throat

Figure 5-35: The 3 foot space in between these wheelstops allows stormwater runoff to enter a vegetated swale within a parking lot. This design could be improved by including more of a drop in grade between the asphalt and the landscape area.

Opening between wheelstops Curb Plan view

Opening between wheelstops Section view


•wheelstops allow water to flow through frequently spaced openings.

•wheelstops are most common in parking lot applications, but they can also be applied to certain street conditions

•need to provide a minimum of 6 inches of space between the wheelstop edge and edge of asphalt paving. this is to provide structural support for the wheelstop

•a minimum 2 inch drop in grade should occur between the edge of paving and the finish grade of the stormwater facility

•pea gravel can be used as a stable mulch material at the wheelstop opening to prevent erosion

sou

rce:

neV

ue

ng

an

ass

oc

iate

s

135c h a p t e r 5 • k e y d e s i g n a n d c o n s t r u c t i o n d e t a i l s

2” minimum drop from concrete

channel to finish grade of landscape


(flow)

Slope entry point of curb cut to direct street runoff into stormwater facility

Grated curb cut to allow for pedestrian circulationSlope concrete channel toward

stormwater facilityStandard curb with curb cut

Grated curb cut for pedestrian circulation


(Landscape Area)

Standard curb1-2” high asphalt or concrete berm for

directing flow �0 degrees into curb cut opening

Figure 5-36: A grated curb cut allows stormwater to pass under a pedestrian egress zone to the stormwater facility.

Grated Curb Cut Plan view

Grated Curb Cut Section view


•grated curb cuts allow stormwater to be conveyed under a pedestrian walkway. the curb cut opening should be at least 18 inches wide

•grates need to be aDa compliant and have sufficient slip resistance

•a 1-2 inch high asphalt or concrete berm should be placed on the downstream side of the curb cut to help direct runoff into the curb cut

•a minimum 2 inch drop in grade should occur between the concrete channel and the finish grade of the stormwater facility.

sou

rce:

keV

in r

oBe

rt p

errY

- c

itY

oF

port

lan

D

s a n m a t e o c o u n t y s u s t a i n a b l e g r e e n s t r e e t s a n d p a r k i n g l o t s g u i d e b o o k13�

type of curb

Documents